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Boy,
your customer sure does not what he is doing. Performing tests at 70C/95%RH
almost guarantees condensed water on your test boards-- white stains is what
is left after the water dries off.
Even the Bellcore requirements are a problem and were created by some hand
waving arguments--they come from some old Bell Labs experiments, where the
test data never could be quantitatively correlated with actual product
behavior and let to the hypothesis of a threshold condition for CAF. That
goes even more for your test conditions which are sure to create extraneous
mechanisms, not just liquid water on your boards.----But I guess the customer
is always right.
Werner Engelmaier
Engelmaier Associates, Inc.
Electronic Packaging, Interconnection and Reliability Consulting
23 Gunther Street
Mendham, NJ 07945 USA
Phone & Fax: 201-543-2747
E-mail: [log in to unmask]
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